US1589083A - Method of making a denture - Google Patents

Description

June 15 1926.

1,589,083 c. L. ALEXANDER METHOD OF MAKING A DENTURE Filed April 2, 1924 INVENTOR.

MA TTORNEIYI Patented June 15, 1926.

CHARLES LEE ALEXANDER, OF CHARLOTTE, NORTH CAROLINA.

METHOD OF MAKING A DENTURE.

Application filed April 2, 1924. Serial No. 703,768.

This invention relates to a method, of making a denture and has for an object to provide a, process for fitting a denture to the mouth accurately, quickly and convenient 1y to produce a denture comfortable for use and one which will retain its position firmly.

A further object of the invention is a method whereby a denture is produced by two impressions taken in the mouth of the patient, the first for forming a model from which a denture is made in very nearly complete form but without accuracy of lit, the second impression being taken directly in the denture itself and insuring absolute accuracy. I

A further object of the invention is the process of making a denture whereby a base plate is roughly fitted to the oral cavity in substantially the usual and ordinary manner and then a further impression taken in the mouth directly in the partially completed denture, the filler material of such second impression being removed along withrthe base plate in process of vulcanizing.

With these and other objects in view, the invention comprises certain novel steps in the production of a denture as will be hereinafter more fully described and claimed.

As illustrating the method, drawings are herewith submitted wherein- Figure 1 shows a model constructed from an impression made in substantially the usual and ordinary manner now practiced in the art.

Figure 2 is a perspective view of the base plate modeled roughly upon the model shown at Figure 1 but without accuracy of fit.

Figure 3 shows the teeth set up on the base 40 plate in substantially the usual and ordinary manner, the buccal and lingual sides or surfaces being completed in this form but the palatal "side or surface being still untitted to the palatal and alveolar ridges.

Figure 4 is a transverse sectional view taken through the piece completed to the form shown at Figure 3 with the palatal. side of the base plate covered with a thin coating of thin impression material in plastic condition, such for instance as plaster of Paris mixture, or any other material which will take and hold an accurate and perfect impression. p I p I Figure 5 is a view similar to Figure l, the

555 impression material having taken the term the palatal and. alveeiar ridge Figure 6 is a transverse sectional view showing unitary structure after vulcanizing.

-Like characters of reference indicate corresponding parts throughout the several views.

In carrying out the process which forms the subject matter of this application, an impression is taken in the mouth of the patient in impression material in the usual manner, such impression material being any usual and ordinary material used in the art or preferred by the particular manipulator. Employing this impression thus produced, which is a step well known in the practice of 7 the art, a model is made, which said model is shown at A, Figural. The making of this impression and the construction of this model need not be done in a particularly careful manner and the model may not, therefore, correspond identically with the jaw structure.

Over this model A, a base plate B is formed. This base plate is made of material well known in the art and is contoured by softening with heat, permitting it to be contoured roughly to the model A. In the production of this base plate, no great accuracy of fitting is necessary but it is desirable that the base plate be constructed of ma- 35 terial presenting a considerable degree of rigidity when cold. This is to prevent warping or buckling of the piece during its later processing.

Upon this base plate B, the teeth C are set up in substantially the usual and ordinary manner by the use of wax or the like,

and the piece is completed to form so far as the buccal and lingual surfaces are concerned as in the present practice. The showing of the teeth G in the drawings is not intended as in any way a limitation upon the present invention or indicating in any manner the particular style or type of teeth which should be employed and the operator 199 is enabled in this process to use any form, type or model of teeth that his fancy may chooseor his judgment may dictate.

As shown in Figure 3, the denture is complete in wax or compound form according to the usual practice of such manipulation with the exception of the surface engaging the alveolar ridges or palatal ridges, if a superior. denture. As shown in the drawings, a superior denture is disclosed but it no is to be understood that an inferior denture will follow like process of manganese and any reference herein to contact with the palate or palatal ridges is not to be understood as in any way limiting the invention to a superior denture.

The piece is now in condition for the second impresion at which point the invention involved in the present invention begins. This second impression is formed by covering the palatal surface of the base plate B with some impression material indicated at D. It has been found in practice that plaster Paris mixed to thin consistency in water and spread in a thin coating over the palatal surface of the base plate is an acceptable impression material and the further steps will be described in terms of plaste'r Paris for impression without in any way limiting the invention to this particular impression material.

The impression material D being properly applied upon the palatal surface of the base plate B, as shown at Figure 4, the piece in its entirety is promptly placed in the mouth of the patient and forced with considerable pressure against the palatal and alveolar ridges so that an absolutely accurate impression of the various contours are received and retained in this impression material, as shown at Figure 5.

After a sufficient lapse of time for the proper hardening of the impression material, the piece is removed from the mouth and the excess plaster trimmed away. A little wax is run around as margin to prevent the plaster from scaling in further manipulation, The plasterfiller impression is coated with astaine'd or unstained separating fluid, which being done, the piece is ready to flask in the usual manner.

After the investment material in theflask has hardened, heat is applied to make itpossible to, open up the flask without breaking the plaster, also to soften the base plate and wax to such a degree as to permit its removal. The removal of this wax base plate and filler leaves the teeth in the investment material of the flask and vulcanizable rubber is packed in, in the usual manner of such procedure and the flask closed under pressure and is ready for vulcanizin'g,

Ordinarily, the impression material carried by the base plate comes away from the flask with the base plate leaving the investment material clean but, in case it should adhere to the surface of the investment ma terial, it is removed by any suitable instrument.

,The steps of setting up the teeth by the employment of the articulator and other well known steps in the construction of such denture has not been described as all of those steps are within the well known practice in the art. Also the manipulation of investment materials, the uses of models, the prop er degree of heat for separation of the flask and plastic in'ipression material, vulcanizing and the like, are so well known in the art as to be mere surplusage in the specification directed to the present invention and are, therefore, left to the practitioner for carrying out.

While this method has been described as a method for the construction of a complete denture, it is obvious that a partial denture can be treated in like manner.

hat I claim to be new is;

1. A method of making a denture consisting in producing a model from an impression, erecting upon the model a denture in wax including a normally rigid wax base plate, complete with the exception of the fitting of the palatal and alveolar surfaces, producing an impression directly from the mouth directly into said base plate, investing the piece so constructed, removing the waxy material and base plate together with the filler impression material, replacing the removed material by vulcanizable material and vulcanizing the entire piece as a homogeneous structure.

2. The method of making a denture consisting in producing a. denture comprising a normally rigid wax base plate roughly fitted to the mouth and supporting teeth secured thereon, taking a second impression from the mouth directly into the base plate, replacing the wax impression material and the base plate with a vulcanizing material, and vulcanizing the entire piece as an unitary structure.

The method of making a denture consisting in fitting roughly a wax denture including a normally rigid wax base plate to an initial model, taking an impression upon the denture so partially completed, investing the piece, removing the waxy and impression material from the investment, replacing with a vulcanizable material, and vulcanizing.

4. The method of making a. denture consisting in producing from an impression a model, roughly fitting anormally rigid wax base plate upon the model, setting up the teeth on the base plate by the use of wax, spreading over the base plate a layer of plastic impression material, inserting the piece into the mouth to take animpression in the impression material, producing a second model as a part of the investment, removing the tiller impression material, the base plate. and the material employed for setting up the teeth, replacing the removed material by a vulcanizing material, employing pressure to contour the vulcanizable material to an exact complement to the jaw, and imbed the artificial teeth therein, and rulcanizing as an unitary structure.

5. The method of making a denture con-- sisting in making a denture, roughly fit ing the jaw of wax like material including a normally rigid Wax base plate, setting up the teeth on said Wax-like material, taking an impression from the mouth directly upon the Wax model, investing the piece, removing the WaX, the impression material and base plate, replacing With a vulcanizable material-l, closing together the investment under pressure to force the said vulcanizable material to conform to the investment cavity, and. vulcanizing in such closed position.

In testimony whereof I afiix my signature.

CHARLES LEE ALEXANDER.

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